如何在PHP中使用redis实现统计缓存mysql压力？

<?php
 header("Content-Type:text/html;charset=utf-8");
 include 'lib/mysql.class.php';
 $mysql_obj = mysql::getConn();
 //redis 
 $redis = new Redis();
 $redis->pconnect('127.0.0.1', 6379);
 if(isset($_SERVER['HTTP_REFERER'])){
  $url_md5 = md5($_SERVER['HTTP_REFERER']);
 }
 $adve_key = 'adve'; 
 $adve_key_exists = 'adve_exists';
 if(!$redis->exists($adve_key_exists)){
  $list = $mysql_obj->fetch_array("select * from user_online_adve");
  if($list){
   foreach ($list as $key => $value) {
    $url_hash = md5($value['adve_url']);
    $adve_hash_key = $adve_key.":".$url_hash;
    $id = $value['id'];
    $redis->set($adve_hash_key,$id);
    $redis->set($adve_key_exists,true);
    //$redis->hmset($adve_hash_key, array('id' =>$id));
    //print_r($redis->get($adve_hash_key));
   }
  }
 }
 $adve_new_key = $adve_key.':'.$url_md5;
 if($redis->exists($adve_new_key)){
   $adve_plus = $adve_new_key.":plus" ;
   if(!$redis->exists($adve_plus)){
    $redis->set($adve_plus,1); 
   }else{
    $redis->incr($adve_plus);
    $num = $redis->get($adve_plus);
    if($num >10){
     $id = $redis->get($adve_new_key);
     // insert to sql;
     $mysql_obj->query("update user_online_adve set adve_num=adve_num+$num where id=$id");
     $redis->set($adve_plus,1);
    }
   }
 }
 header('HTTP/1.0 301 Moved Permanently');
 header('Location: https://itunes.apple.com/cn/app/san-guo-zhi15-ba-wangno-da-lu/id694974270?mt=8');
/*
 if(){
   $adve_plus = $adve_key.":plus" ;
   if($redis->exists($adve_plus)){
    $redis->incr($adve_plus);
   }else{
    $redis->set($adve_plus,1); 
   }
   echo $redis->get($adve_plus);
 }
 foreach ($list as $key => $value) {
   $url_hash = md5($value['adve_url']);
   $id = $value['id'];
   $adve_num = $value['adve_num'];
   $adve_plus = $adve_key.":plus" ;
   if($redis->exists($adve_plus)){
    $redis->incr($adve_plus);
   }else{
    $redis->set($adve_plus,1); 
   }
   echo $redis->get($adve_plus);
   //if($redis->)
   //$redis->hmset($adve_key, array('id' =>$id, 'adve_num'=>$adve_num));
   //print_r($redis->hmget("adve:$url_hash", array('adve_num')));
 }
  print_r($list);
*/